what is java script

JavaScript is a scripting language designed primarily for adding interactivity to Web pages and creating Web applications. The language was first implemented by Netscape Communications Corp. in Netscape Navigator 2 beta (1995). JavaScript is different from the Java language (developed in the 1990s at Sun Microsystems). However, the two languages can interoperate well. Client-side JavaScript programs, or scripts, can be embedded directly in HTML source of Web pages. (Note: There is also server-side JavaScript, but it's beyond the scope of this FAQ collection.) Depending on the Web developer's intent, script code may run when the user opens the Web page, clicks or drags some page element with the mouse, types something on the keyboard, submits a form, or leaves the page.